【摘要】 文章在分析图像小波分解系数的树结构关系的基础上,提出了一种基于图像小波系数树的扩频盲水印,该方法将一位水印信息通过扩频嵌入到宿主图像的一棵小波树所有系数中,并结合人眼的视觉特性确定水印嵌入强度。提取水印时,用相关检测方法独立提取每一位水印信息。实验结果表明:该方法保证了水印的不可见性,对包括JPEG压缩、图像剪切、图像扭曲、旋转有较强的鲁棒性,是一种很有前途的水印技术。更多还原

【Abstract】 The tree structure relation of wavelet coefficients is analysed at frist,then a method of spread-spectrum watermarking based on tree structure relation of wavelet coefficient is put forward.With this method,each watermark bit is embedded in all wavelet coefficients of one tree,and the watermark strength is determined by the characteristic of human visual system.While extracting,each watermark is extracted independtly using correlation detection.Experiment results show that the watermarking is invisible,and has good robustness to JPEG compression,cropping,twisting,totation etc.It’s a perspective watermarking method.更多还原